JP2012169177A - Discharge lamp lighting device - Google Patents

Discharge lamp lighting device Download PDF

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Publication number
JP2012169177A
JP2012169177A JP2011030021A JP2011030021A JP2012169177A JP 2012169177 A JP2012169177 A JP 2012169177A JP 2011030021 A JP2011030021 A JP 2011030021A JP 2011030021 A JP2011030021 A JP 2011030021A JP 2012169177 A JP2012169177 A JP 2012169177A
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power
voltage
temperature
power command
discharge lamp
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JP5853222B2 (en
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Masahiro Nishikawa
政広 西川
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Panasonic Corp
パナソニック株式会社
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Abstract

Disclosed is a discharge lamp lighting device in which stress applied to parts is reduced.
A discharge lamp lighting device includes a DC / DC converter 3 that converts an input power supply voltage Vin into a DC voltage having a desired voltage value, and an output voltage of the DC / DC converter 3 that is an AC voltage having a desired voltage value. And a DC / AC converter 4 for converting to DC, and a DC / DC converter 3 and a power control unit 5 for controlling the output of the DC / AC converter 4. When the first preset time elapses from the time when the power supplied to the discharge lamp 11 starts to decrease below a predetermined maximum power at the start of lighting, the power control unit 5 outputs the AC output of the DC / AC converter 4. Is provided with a power command circuit 58 that outputs a second power command signal for setting the output of the DC / DC converter 3 to a power value higher than a predetermined steady value at each timing when the polarity of the signal is switched.
[Selection] Figure 1

Description

  The present invention relates to a discharge lamp lighting device.

  In recent years, high-intensity discharge lamps have been used for vehicle headlamps and liquid crystal projectors from the viewpoint of energy saving and high luminance. In general, high-intensity discharge lamps are lit with an AC rectangular wave, but at the timing when the polarity of the AC rectangular wave is reversed, that is, at the zero-cross point, instantaneous interruption of current in the lamp, re-ignition, and stable discharge It was easy to cause deterioration of the characteristics, and was a cause of unnecessary radiation noise. Furthermore, when lighting control is performed with low power, the current may be interrupted at the zero cross point of the current, and the lamp may be extinguished.

  Therefore, in order to prevent the lamp from extinguishing, there is also provided one in which a superimposed voltage is added immediately before the polarity of the AC rectangular wave is switched to speed up the rising at the time of zero crossing of the current (for example, see Patent Document 1).

JP 2003-133092 (paragraph [0013] -paragraph [0016] and FIGS. 1 and 2)

  By the way, in the case of the high-intensity discharge lamp as described above, a few seconds after the start of lighting is a luminous flux rising period that requires lamp power about twice the rated lamp power. If a superimposed voltage is applied immediately before the polarity of the AC rectangular wave is switched during the luminous flux rising period to accelerate the rising of the current, excessive stress may be applied to the components.

  The present invention has been made in view of the above problems, and an object thereof is to provide a discharge lamp lighting device in which stress applied to parts is reduced.

  A discharge lamp lighting device according to the present invention includes a first power converter that has a switching element and converts an input power supply voltage to a DC voltage having a desired voltage value, and an output voltage of the first power converter is desired. A second power conversion unit that converts the voltage value into an alternating voltage, and a power control unit that controls the outputs of the first power conversion unit and the second power conversion unit, the power control unit includes: First power command control means for outputting a first power command signal for setting the output of the power converter to a predetermined steady value, and the power supplied to the discharge lamp at the start of lighting decreases below a predetermined maximum power When a preset first set time elapses from the start time, the output of the first power conversion unit is higher than the steady value at each timing when the polarity of the AC output of the second power conversion unit is switched. A second power command signal for setting the power value of the second power command signal Wherein the of have and a power instruction control unit.

  The discharge lamp lighting device includes a temperature detection unit that detects the device temperature or the ambient temperature, and the first set time depends on the temperature detection unit as compared with a case where the temperature detected by the temperature detection unit is lower than a predetermined set temperature. It is preferable that the detected temperature is set longer when the detected temperature is equal to or higher than the set temperature.

  In this discharge lamp lighting device, the power control unit includes a first voltage detection unit that detects an output voltage of the first power conversion unit, and a current detection unit that detects an output current of the first power conversion unit. And the first power command control means preferably sets the power command value included in the first power command signal based on the detection result of the first voltage detection unit and the detection result of the current detection unit. .

  The discharge lamp lighting device further includes a temperature detection unit that detects the device temperature or the ambient temperature, and a second voltage detection unit that detects the power supply voltage, and the first power command control means includes at least the temperature detection unit. It is also preferable to set the power command value included in the first power command signal based on one of the detection result of the second voltage detection unit and the detection result of the second voltage detection unit.

  The discharge lamp lighting device further includes a temperature detection unit that detects the device temperature or the ambient temperature, and the second power command control means is included in the second power command signal based on the detection result of the temperature detection unit. It is also preferable to set a power command value.

  Furthermore, it is preferable that the discharge lamp lighting device further includes a temperature detection unit that detects the device temperature or the ambient temperature, and the temperature detection unit is configured using a thermistor.

  The discharge lamp lighting device further includes a second voltage detection unit that detects a power supply voltage, and the second power command control unit is configured such that the voltage detected by the second voltage detection unit is equal to or lower than a predetermined reference voltage. When the second set time longer than the first set time elapses from the time when the power supplied to the discharge lamp starts to decrease below the maximum power from the start of lighting, the polarity of the AC output of the second power conversion unit changes. It is also preferable to output the second power command signal at each switching timing.

  The discharge lamp lighting device further includes a second voltage detection unit that detects a power supply voltage, and the second power command control means uses the second power command signal based on the detection result of the second voltage detection unit. It is also preferable to set the electric power command value included in.

  There is an effect that it is possible to provide a discharge lamp lighting device in which stress applied to parts is reduced.

1 is a circuit diagram of a discharge lamp lighting device according to Embodiment 1. FIG. It is a graph for demonstrating operation | movement same as the above. It is another graph for demonstrating operation | movement same as the above. It is another graph for demonstrating operation | movement same as the above. It is a time chart for demonstrating operation | movement same as the above. It is another time chart for demonstrating operation | movement same as the above. It is another graph for demonstrating operation | movement same as the above. It is another time chart for demonstrating the operation | movement same as the above. It is a block diagram which shows the other example of the temperature detection part used for the same as the above. (A), (b) is a graph for demonstrating operation | movement of the discharge lamp lighting device of Embodiment 2. FIG. It is a graph which shows the operating characteristic of the capacitor | condenser which comprises the voltage detection part used for the discharge lamp lighting device of Embodiment 3. The operational characteristics of the capacitor constituting the voltage detector used in the above are shown, wherein (a) is a graph when the time constant is large, and (b) is a graph when the time constant is small. It is a time chart for demonstrating operation | movement same as the above. (A), (b) is a graph for demonstrating operation | movement of the discharge lamp lighting device of Embodiment 4. FIG.

  Hereinafter, embodiments of a discharge lamp lighting device will be described with reference to the drawings. The discharge lamp lighting device is used for lighting a high-intensity discharge lamp (HID) such as a metal halide.

(Embodiment 1)
FIG. 1 is a circuit diagram of the discharge lamp lighting device according to the first embodiment. The discharge lamp lighting device includes a DC / DC converter (first power converter) 3 that converts a power supply voltage Vin input from a DC power supply 1 into a DC voltage having a desired voltage value, and an output of the DC / DC converter 3. A DC / AC converter (second power conversion unit) 4 that converts a voltage into an AC voltage having a desired voltage value, and a power control unit 5 that controls the output of the DC / DC converter 3 and the DC / AC converter 4 are provided. . In addition, the discharge lamp lighting device includes an input filter circuit 2, an igniter circuit 6, a starting auxiliary circuit 7, an output filter circuit 10, a temperature detection unit 8 that detects, for example, a device temperature and an ambient temperature, and a DC power source 1. And a voltage detection unit (second voltage detection unit) 9 for detecting the power supply voltage Vin.

  The input filter circuit 2 includes an inductor L1 and a capacitor C1, and the inductor L1 does not saturate even at the maximum current flowing through the inductor L1, and has sufficient DC superposition characteristics. Further, the inductor L1 has a function of attenuating a ripple component from the DC power source 1, switching noise generated in a switching element Q1 described later, and the like by being used in combination with the capacitor C1. A high-capacity aluminum electrolytic capacitor C2 is connected between the output terminals of the input filter circuit 2. The aluminum electrolytic capacitor C2 is released when the power supply from the DC power source 1 is momentarily cut off, for example. It functions as a backup power source for preventing the power supply to the lamp 11 from being interrupted for a certain period.

  The DC / DC converter 3 includes a transformer Tr1 that boosts, steps down, or boosts the power supply voltage Vin, a switching element Q1 that is made of, for example, a MOSFET and is connected in series to the primary side of the transformer Tr1, and a diode D1. Is a so-called flyback converter circuit. In the DC / DC converter 3, when the switching element Q <b> 1 is turned on, energy is accumulated by a current flowing through an inductor component on the primary side of the transformer Tr <b> 1. Thereafter, when the switching element Q1 is turned off, the energy is transmitted to the inductor component on the secondary side by the magnetic flux coupling of the transformer Tr1, the diode D1 is turned on, and a current flows on the secondary side of the transformer Tr1. Here, Np in FIG. 1 indicates the number of turns on the primary side of the transformer Tr1, and Ns indicates the number of turns on the secondary side of the transformer Tr1.

  The DC / AC converter 4 is a full bridge circuit composed of four switching elements Q2 to Q5 made of, for example, an IGBT, a MOSFET, or a bipolar transistor, and a drive signal output from a drive control circuit 57 of the power control unit 5 described later. An AC rectangular wave is output by turning on and off switching elements Q2 to Q5 by Sig1 and Sig2.

  The igniter circuit 6 includes a capacitor C4, a discharge gap g1, a pulse transformer Tr2, and the like, and activates the discharge lamp 11 by applying a pulse voltage of several kV between the electrodes of the discharge lamp 11 and causing dielectric breakdown between the electrodes. .

  The start assist circuit 7 has a function of outputting a predetermined current from the DC / DC converter 3 in a period of about 100 μsec immediately after the start of the discharge lamp 11 in which the power control unit 5 cannot perform feedback processing.

  The temperature detection unit 8 includes a temperature detection IC 1 that operates when a reference voltage Vcc is applied. The temperature detection unit 8 detects the ambient temperature Ta and outputs a voltage signal VT1 corresponding to the detected ambient temperature Ta to the power control unit. 5 is output.

  The power control unit 5 includes a voltage detection unit (first voltage detection unit) 53 that detects an output voltage of the DC / DC converter 3 and a current detection unit 54 that detects an output current of the DC / DC converter 3. The power control unit 5 corresponds to a power command circuit 51 that outputs a power command signal including a preset power command value P1, a power command signal from the power command circuit 51, and a detected voltage from the voltage detection unit 9. Based on the voltage signal and the voltage signal VT1 from the temperature detector 8, the power supplied to the discharge lamp 11 is set to a preset limit value P21 (see FIG. 3) or a power command value P1 from the power command circuit 51. And a power limiting circuit 52 that outputs a power limiting signal including a power limiting value P2 that limits the smaller one of the two.

  Further, the power control unit 5 includes a current command calculation circuit 55 that outputs a current command signal based on the power limit signal from the power limit circuit 52 and the voltage signal corresponding to the detection voltage from the voltage detection unit 53, and a current detection And an operational amplifier 56 that compares the current value detected by the unit 54 with the current command signal from the current command calculation circuit 55 and outputs a power command signal (first power command signal). The power control unit 5 switches the polarity of the AC output of the DC / AC converter 4 and the drive control circuit 57 that outputs the drive signals Sig1 and Sig2 for turning on and off the switching elements Q2 to Q5 of the DC / AC converter 4. A power command circuit (second power command) for outputting a power command signal (second power command signal) for setting a predetermined power value higher than the power command value (steady value) from the operational amplifier 56 at each timing. Control means) 58. Here, in the present embodiment, the power command circuit 51, the power limit circuit 52, the current command calculation circuit 55, and the operational amplifier 56 constitute a first power command control means.

  Here, FIG. 2 is a graph showing a change in the power command value P1 from the power command circuit 51. According to this graph, the power command circuit 51 outputs the maximum value P11 as the power command value P1 from the time t0 to the time t1, which is the lighting start time, and the power command value P1 from the time t1 to the time t2. The rated value P10 is gradually decreased from the maximum value P11 to the rated value P10, and the rated value P10 is output as the power command value P1 after time t2. When restarting the discharge lamp 11, the power command circuit 51 adjusts the power command value P <b> 1 according to the lamp temperature of the discharge lamp 11.

  Next, FIG. 3 is a graph showing a change in the power limit value P2 from the power limit circuit 52. The power limit circuit 52 compares the power command value P11 included in the power command signal input from the power command circuit 51 at the start of startup with a preset limit value P21, and the smaller one is the power limit value P2. Output as. For example, in the example shown in FIG. 3, since power command value P11> limit value P21, limit value P21 is output from power limit circuit 52 as power limit value P2.

  FIG. 4 is a graph showing changes in the limit value P21 accompanying changes in the ambient temperature Ta. For example, when the ambient temperature Ta is in the range of −40 ° C. to + 150 ° C., the limit value P21 = P211 is set from the lowest temperature T0 (= −40 ° C.) to the predetermined set temperature T1, and the ambient temperature Ta is equal to or higher than the set temperature T1. Then, the limit value P21 is decreased linearly. When the ambient temperature Ta reaches the maximum temperature T2 (= + 150 ° C.), the limit value P21 = P210 (P210 <P211) is set. Here, the set temperature T1 is set in a range of 70 ° C. to 120 ° C., for example, from the characteristics of each electronic component (eg, MOSFET, diode, transformer, resistor, etc.) constituting the discharge lamp lighting device.

  Next, FIG. 5 is a time chart for explaining the operation of the DC / AC converter 4. When the drive signal Sig1 output from the drive control circuit 57 of the power control unit 5 is on, the switching elements Q2 and Q5 of the DC / AC converter 4 are on, so that the current I2 in FIG. Flowing. Further, when the drive signal Sig2 is on, the switching elements Q3 and Q4 of the DC / AC converter 4 are turned on, so that a current I3 having a direction opposite to the current I2 flows. That is, the output current Iout from the DC / AC converter 4 is a rectangular wave that is inverted every time Ts as shown in FIG. Since the DC / AC converter 4 may be damaged when the drive signals Sig1 and Sig2 are turned on at the same time, as shown in FIG. 5, between the on-period of the drive signal Sig1 and the on-period of the drive signal Sig2. Is provided with a dead time td.

  By the way, when the DC / DC converter 3 is controlled only by the power command signal (first power command signal) output from the operational amplifier 56, when the power supplied from the DC power supply 1 decreases, the current zero crossing occurs. There is a possibility that the current stops at the point and the discharge lamp 11 goes out. Therefore, in this embodiment, in order to prevent the discharge lamp 11 from going out, a method of superimposing a voltage by the power command circuit (second power command control means) 58 is adopted. Hereinafter, a specific description will be given based on FIGS. 6 and 7.

  The power command value P1 from the power command circuit 51 is maximum (P11) from time t0 to time t1, which is the lighting start time, and after time t1, the power command value P1 is gradually decreased and steady at time t2. The value is P10. After time t3 when a preset first set time elapses from time t1, the power command value P3 higher than the steady-state value P10 is output at each timing when the polarity of the AC output of the DC / AC converter 4 is switched. Output from the circuit 58. In the present embodiment, as shown in FIG. 7, the power command value P3 is gradually increased as time passes, and reaches the maximum value P31 at time t5. As a result, the voltage V1 and the current I1 applied to the discharge lamp 11 gradually increase with time as shown in FIG. 6, and after time t5, the voltage V1 (= V11) and the current I1 (= I11). Since both currents become maximum values and the current I1 is easy to flow, the rest period of the lamp current is unlikely to occur, and it is possible to prevent the discharge lamp 11 from turning off at the time of polarity reversal.

  Here, as shown in FIG. 7, when the power command value P <b> 3 is increased over time, the load applied to the DC / DC converter 3 can be kept low. Transient stress applied to parts can be reduced. In addition, said effect becomes remarkable when the steady value P10 is large.

  Next, FIG. 8 is a flowchart for explaining the operation of the power command circuit 58 according to the ambient temperature Ta detected by the temperature detector 8. When the ambient temperature Ta is lower than the predetermined set temperature T1, the first set time set in advance from the time t1 when the power supplied to the discharge lamp 11 starts to drop below the maximum power P11 at the start of lighting. The power command value P3 starts to be output from the power command circuit 58 at the elapsed time t3. On the other hand, when the ambient temperature Ta is equal to or higher than the set temperature T1, the power command circuit 58 supplies the power at the time t4 (t4> t3) when a preset first set time elapses from the time t1. The command value P3 starts to be output. When the ambient temperature Ta is lower than the set temperature T1, the voltage V1 (= V11) and the current I1 (= I11) become maximum at time t5, whereas the ambient temperature Ta is When the temperature is equal to or higher than the set temperature T1, the voltage V1 (= V11) and the current I1 (= I11) become maximum at time t6 (t6> t5). As a result, even if the ambient temperature Ta is high, the temperature rise of the components of the DC / DC converter 3 can be kept low, and the stress applied to the components can be reduced.

  Thus, according to the present embodiment, after the luminous flux rising period in which the predetermined maximum power P11 is supplied to the discharge lamp 11, the power command is reduced from the power command circuit 58 after the supply power has decreased to a predetermined power value. Since the power command signal (second power command signal) including the command value P3 is output, the stress applied to the components of the DC / DC converter 3 compared to the case where the superimposed voltage is added from the light beam rising period as in the conventional example. Can be reduced. In addition, when the ambient temperature Ta detected by the temperature detector 8 is equal to or higher than the predetermined set temperature T1, the first set time is longer than when the ambient temperature Ta is lower than the set temperature T1, and the release time Since the second power command signal is output from the time when the power supplied to the lamp 11 is further reduced, the temperature rise of the components of the DC / DC converter 3 can be suppressed low, and as a result, the ambient temperature Ta is high. However, it is possible to reduce the stress applied to the components. Furthermore, according to the present embodiment, power control that follows the output voltage and output current of the DC / DC converter 3 and power control that follows the detection result of the temperature detection unit 8 and the detection result of the voltage detection unit 9 are performed. It can be carried out.

  Here, in the above embodiment, the temperature detection unit 8 is configured using the temperature detection IC 1, but the temperature detection unit 8 may be configured using a thermistor RT as shown in FIG. 9. In this temperature detector 8, a series circuit of a thermistor RT and a resistor R1 is connected between the reference voltage Vcc and the ground, and a voltage signal VT2 corresponding to the detected temperature is output from the connection point of the thermistor RT and the resistor R1. . By configuring the temperature detection unit 8 using the thermistor RT as described above, there is an advantage that the size can be reduced as compared with the case where the temperature detection IC 1 is used, and the overall discharge lamp lighting device can be reduced in size. .

  In this embodiment, the flyback DC / DC converter 3 has been described as an example of the first power conversion unit. However, any DC converter that generates a desired DC voltage from the power supply voltage Vin may be used. A DC / DC converter may be used. Furthermore, the first power conversion unit is not limited to the DC / DC converter using a transformer, and may be a conventionally known chopper circuit, for example.

(Embodiment 2)
Embodiment 2 of the discharge lamp lighting device will be described with reference to FIG. In the present embodiment, when the ambient temperature Ta detected by the temperature detector 8 is higher than a predetermined set temperature T1, the power command circuit 58 determines that the ambient temperature Ta is lower than the set temperature T1. This is different from the first embodiment in that the power command value P3 is reduced. Since the circuit configuration is the same as that of the first embodiment, FIG. 1 is referred to when necessary.

  As shown in FIG. 1, the discharge lamp lighting device of the present embodiment includes a DC / DC converter 3, a DC / AC converter 4, a power control unit 5, an input filter circuit 2, an igniter circuit 6, and a start assist. A circuit 7, an output filter circuit 10, a temperature detection unit 8, and a voltage detection unit 9 are provided. Note that the detailed description of each circuit has been described in Embodiment 1, and is omitted here.

  Next, the operation of the power command circuit 58 will be described with reference to FIG. A broken line in FIG. 10A indicates a change in the power command value P3 when the ambient temperature Ta detected by the temperature detection unit 8 is a predetermined set temperature T1. The power command value is supplied from the power command circuit 58 at time t4 when the preset first set time elapses from time t1 when the power supplied to the discharge lamp 11 starts to decrease below the maximum power P11 at the start of lighting. P3 starts to be output, and the maximum value P3 = P31 is reached at time t6. On the other hand, the solid line in FIG. 10A shows a change in the power command value P3 when the ambient temperature Ta is T3 (T3> T1) higher than the set temperature T1. In this case, similarly, power command value P3 starts to be output from power command circuit 58 at time t4, but power value P32 smaller than the maximum value P31 is output as power command value P3 at time t6. That is, in this embodiment, the initial value of the power command value P3 is constant regardless of the temperature, and the maximum value of the power command value P3 is set low by decreasing the slope as the temperature increases.

  Thus, according to the present embodiment, when the ambient temperature Ta is higher than the predetermined set temperature T1, the power command value P3 for the DC / DC converter 3 is set low, so that the DC / DC converter 3 The temperature rise of the components can be suppressed low, and the stress applied to the components can be reduced even when the ambient temperature Ta is high.

  In the example shown in FIG. 10A, the initial value of the power command value P3 from the power command circuit 58 is constant regardless of the temperature, and the slope is reduced as the temperature increases. As shown in FIG. 4, the inclination may be constant regardless of the temperature, and the initial value may be decreased as the temperature increases. Similarly, the stress applied to the components of the DC / DC converter 3 can be reduced.

(Embodiment 3)
Embodiment 3 of the discharge lamp lighting device will be described with reference to FIGS. In the present embodiment, the output timing of the power command value P3 from the power command circuit 58 is varied in accordance with the detection result of the voltage detection unit 9, that is, the magnitude of the power supply voltage Vin of the DC power supply 1. Is different. Since the circuit configuration is the same as that of the first embodiment, FIG. 1 is referred to when necessary.

  As shown in FIG. 1, the discharge lamp lighting device of the present embodiment includes a DC / DC converter 3, a DC / AC converter 4, a power control unit 5, an input filter circuit 2, an igniter circuit 6, and a start assist. A circuit 7, an output filter circuit 10, a temperature detection unit 8, and a voltage detection unit 9 are provided. Note that the detailed description of each circuit has been described in Embodiment 1, and is omitted here.

Here, the voltage detection unit 9 of the present embodiment divides the power supply voltage Vin using, for example, a resistor (not shown), and the power supply voltage is generated by a time constant circuit including a resistor and a ripple removing capacitor C5. Detect Vin. The time constant τ of this time constant circuit is the time until the charged amount of the capacitor C5 reaches 63% of the maximum value, and the time constant τ can be controlled by changing the product of the resistor and the capacitor C5. . Here, the terminal voltage Vc of the capacitor C5 is represented by Vc = e− (t / CR) (C is a capacitor capacity, R is a resistance value), and is represented by a time constant τ = CR . In the example shown in FIG. 11, it can be seen that it takes time ta until the terminal voltage of the capacitor C5 reaches Vc.

  Next, FIGS. 12A and 12B are graphs showing changes in the terminal voltage of the capacitor C5 when the voltage dividing ratio by the resistance is constant and the capacitance of the capacitor C5 is changed. First, FIG. 12A is a graph when the time constant τ is increased by increasing the capacitance of the capacitor C5. In this case, the ripple component is as small as Vr1, but the terminal voltage of the capacitor C5 reaches Vc. The time tb until (tb> ta) is long and the responsiveness is not good. On the other hand, FIG. 12B is a graph when the time constant τ is reduced by reducing the capacitance of the capacitor C5. In this case, the time tc until the terminal voltage of the capacitor C5 reaches Vc (tc <ta ) Is short, but the ripple component is as large as Vr2, which may cause the power control unit 5 to malfunction. Therefore, it is necessary to set the constants of the resistor and the capacitor C5 to optimum values according to the ripple component and the response.

  FIG. 13 is a flowchart for explaining the operation of the power command circuit 58 according to the detection result of the voltage detection unit 9, that is, the magnitude of the power supply voltage Vin of the DC power supply 1. When the power supply voltage Vin is higher than the predetermined reference voltage V2, a first preset time elapses from time t1 when the power supplied to the discharge lamp 11 starts to decrease below the maximum power P11 at the start of lighting. At time t3, the power command value 58 starts to be output from the power command circuit 58. On the other hand, when the power supply voltage Vin is equal to or lower than the reference voltage V2, the power command circuit 58 supplies the power at the time t4 (t4> t3) when a preset second set time elapses from the time t1. The command value P3 starts to be output. That is, in the present embodiment, the second set time is set longer than the first set time, and when the power supply voltage Vin is equal to or lower than the reference voltage V2, the supply power P1 to the discharge lamp 11 is Further, since the power command value P3 is output from the time when the voltage drops, the stress applied to the components of the DC / DC converter 3 can be reduced.

(Embodiment 4)
Embodiment 4 of the discharge lamp lighting device will be described with reference to FIG. The present embodiment is different from the first embodiment in that the power command value P3 from the power command circuit 58 is changed according to the magnitude of the power supply voltage Vin input to the DC / DC converter 3. Since the circuit configuration is the same as that of the first embodiment, FIG. 1 is referred to when necessary.

  As shown in FIG. 1, the discharge lamp lighting device of the present embodiment includes a DC / DC converter 3, a DC / AC converter 4, a power control unit 5, an input filter circuit 2, an igniter circuit 6, and a start assist. A circuit 7, an output filter circuit 10, a temperature detection unit 8, and a voltage detection unit 9 are provided. Note that the detailed description of each circuit has been described in Embodiment 1, and is omitted here.

  Next, the operation of the power command circuit 58 will be described with reference to FIG. A broken line in FIG. 14A indicates a change in the power command value P3 when the power supply voltage Vin detected by the voltage detection unit 9 is the predetermined reference voltage V0. The power command value is supplied from the power command circuit 58 at time t4 when the preset first set time elapses from time t1 when the power supplied to the discharge lamp 11 starts to decrease below the maximum power P11 at the start of lighting. P3 starts to be output, and the maximum value P3 = P31 is reached at time t6. On the other hand, the solid line in FIG. 14A shows a change in the power command value P3 when the power supply voltage Vin is a voltage V3 (V3> V0) lower than the reference voltage V0. In this case, similarly, power command value P3 starts to be output from power command circuit 58 at time t4, but power value P33 smaller than the maximum value P31 is output as power command value P3 at time t6. That is, in the present embodiment, the initial value of the power command value P3 is constant regardless of the magnitude of the power supply voltage Vin, and the maximum value of the power command value P3 is set low by decreasing the slope as the power supply voltage Vin decreases. is doing.

  Thus, according to the present embodiment, when the power supply voltage Vin is lower than the predetermined reference voltage V0, the power command value P3 for the DC / DC converter 3 is set low, so that the DC / DC converter 3 The temperature rise of the components can be suppressed low, and the stress applied to the components can be reduced even when the power supply voltage Vin is low.

  In the example shown in FIG. 14A, the initial value of the power command value P3 from the power command circuit 58 is constant regardless of the magnitude of the power supply voltage Vin, and the slope is reduced as the power supply voltage Vin decreases. However, as shown in FIG. 14B, the slope may be constant regardless of the magnitude of the power supply voltage Vin, and the initial value may be reduced as the power supply voltage Vin decreases. Similarly, the components of the DC / DC converter 3 Can reduce stress.

3 DC / DC converter (first power converter)
4 DC / AC converter (second power converter)
5 Power Control Unit 11 Discharge Lamp 58 Power Command Circuit (Second Power Command Control Unit)
Vin power supply voltage

Claims (8)

  1. A first power conversion unit that includes a switching element and converts an input power supply voltage into a DC voltage having a desired voltage value;
    A second power conversion unit that converts the output voltage of the first power conversion unit into an AC voltage having a desired voltage value;
    A power control unit that controls outputs of the first power conversion unit and the second power conversion unit;
    The power control unit includes a first power command control unit that outputs a first power command signal for setting the output of the first power conversion unit to a predetermined steady value;
    Timing at which the polarity of the AC output of the second power conversion unit is switched when a preset first set time elapses from the time when the power supplied to the discharge lamp starts to drop below a predetermined maximum power at the start of lighting. And a second power command control means for outputting a second power command signal for setting the output of the first power converter to a predetermined power value higher than the steady value. A discharge lamp lighting device characterized by that.
  2. It has a temperature detector that detects the device temperature or ambient temperature,
    The first set time is set to be longer when the temperature detected by the temperature detector is equal to or higher than the set temperature, compared to when the temperature detected by the temperature detector is lower than a predetermined set temperature. The discharge lamp lighting device according to claim 1.
  3. The power control unit includes a first voltage detection unit that detects an output voltage of the first power conversion unit, and a current detection unit that detects an output current of the first power conversion unit,
    The first power command control means sets a power command value included in the first power command signal based on a detection result of the first voltage detection unit and a detection result of the current detection unit. The discharge lamp lighting device according to claim 1 or 2.
  4. A temperature detection unit that detects an apparatus temperature or an ambient temperature; and a second voltage detection unit that detects the power supply voltage;
    The first power command control means determines a power command value included in the first power command signal based on at least one of the detection result of the temperature detection unit or the detection result of the second voltage detection unit. It sets, The discharge lamp lighting device of any one of Claims 1-3 characterized by the above-mentioned.
  5. It has a temperature detector that detects the device temperature or ambient temperature,
    The said 2nd electric power command control means sets the electric power command value contained in the said 2nd electric power command signal based on the detection result of the said temperature detection part, The any one of Claims 1-4 characterized by the above-mentioned. The discharge lamp lighting device according to item.
  6. It has a temperature detector that detects the device temperature or ambient temperature,
    The discharge lamp lighting device according to any one of claims 1 to 5, wherein the temperature detection unit is configured using a thermistor.
  7. A second voltage detector for detecting the power supply voltage;
    When the voltage detected by the second voltage detector is equal to or lower than a predetermined reference voltage, the second power command control means starts from when the power supplied to the discharge lamp starts to decrease below the maximum power from the start of lighting. When the second set time longer than the first set time elapses, the second power command signal is output at each timing when the polarity of the AC output of the second power conversion unit is switched. The discharge lamp lighting device according to any one of claims 1 to 6.
  8. A second voltage detector for detecting the power supply voltage;
    The second power command control means sets a power command value included in the second power command signal based on a detection result of the second voltage detection unit. The discharge lamp lighting device according to any one of the above.
JP2011030021A 2011-02-15 2011-02-15 Discharge lamp lighting device Expired - Fee Related JP5853222B2 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08321389A (en) * 1995-05-26 1996-12-03 Matsushita Electric Works Ltd Discharge lamp lighting device
JP2002319498A (en) * 2001-02-13 2002-10-31 Koito Mfg Co Ltd Discharge lamp lighting circuit
JP2006278012A (en) * 2005-03-28 2006-10-12 Matsushita Electric Works Ltd Discharge lamp lighting device, light source device, and lighting system
JP2010055840A (en) * 2008-08-26 2010-03-11 Panasonic Electric Works Co Ltd Discharge lamp-lighting device, headlamp device, and vehicle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08321389A (en) * 1995-05-26 1996-12-03 Matsushita Electric Works Ltd Discharge lamp lighting device
JP2002319498A (en) * 2001-02-13 2002-10-31 Koito Mfg Co Ltd Discharge lamp lighting circuit
JP2006278012A (en) * 2005-03-28 2006-10-12 Matsushita Electric Works Ltd Discharge lamp lighting device, light source device, and lighting system
JP2010055840A (en) * 2008-08-26 2010-03-11 Panasonic Electric Works Co Ltd Discharge lamp-lighting device, headlamp device, and vehicle

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